1. Processing Fingerprints

2. Processing Fingerprints
Automated Fingerprint Identification System (AFIS)
Provides law enforcement agencies with a computerized method for generating suspect lists from fingerprint data

3. Reminder…
Latent prints are impressions produced by the ridged skin on human fingers
There are a number of ways to develop latent prints.

4. Developing Latent Prints
Fluorescence-
Certain properties of latent print residue will fluoresce when exposed to a laser light
Detects prints on surfaces not suitable for powder/chemicals
Must be preserved through photography

5. Developing Latent Prints Continued
Powder –
Come in various colors such as black, gray, white, red and super black. It is best to select a powder that is in contrast to the surface on which is being processed.

6. Powders
Regular powders may be used on any surface, which is relatively smooth and non-tacky

7. Powders
Magnetic powders are sometimes more effective on rough, grained or porous surfaces, which would otherwise become heavily coated with regular powder
After being “dusted,” prints are then lifted with tape

8. Developing Latent Prints Continued
Chemical Enhancement –
Apply something that will chemically react with one of the chemicals of latent fingerprints. The new chemical composition will make the latent fingerprints easily visible

9. Chemical Enhancement Examples
Superglue – reacts with amino acids, fatty acids, and proteins in the fingerprint and the moisture in the air to produce a visible, sticky white material that forms along the ridges of the fingerprint
Ninhydrin

10. Superglue Fuming

11. Ninhydrin